我想在 apache tomcat 中上传一个文件，并使用 JSP 从文本字段中将数据保存在 MySQL 中。这样做时，我无法将 JSP 页面中的值传递给 Servlet 并保存在数据库中。我该怎么做？我尝试了以下代码行：JSP：
<form action="UploadServlet" method="post"
enctype="multipart/form-data">
<input type="file" name="file" size="50" />
<br />
<input name="a" type="text"/>
<br />
<input type="submit" value="Upload File" />
</form>
我还在 Servlet 中使用了以下代码行：
小服务程序
import java.io.*;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.SQLException;
import java.util.*;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.swing.JOptionPane;
import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;
public class UploadServlet extends HttpServlet {
private boolean isMultipart;
private String filePath;
private int maxFileSize = 10000 * 1024;
private int maxMemSize = 5 * 1024;
private File file;
String gi;
@Override
public void init() {
// Get the file location where it would be stored.
filePath = getServletContext().getInitParameter("file-upload");
}
protected void processRequest(HttpServletRequest request, HttpServletResponse
response) throws ServletException, IOException {
// Check that we have a file upload request
isMultipart = ServletFileUpload.isMultipartContent(request);
response.setContentType("text/html;charset=UTF-8");
PrintWriter out = response.getWriter();
gi =request.getParameter("a");
if (!isMultipart) {
out.println("<html>");
out.println("<head>");
out.println("<title>Servlet upload</title>");
out.println("</head>");
out.println("<body>");
out.println("<p>No file uploaded</p>");
out.println("</body>");
out.println("</html>");
return;
}
DiskFileItemFactory factory = new DiskFileItemFactory();
// maximum size that will be stored in memory
factory.setSizeThreshold(maxMemSize);
// Location to save data that is larger than maxMemSize.
factory.setRepository(new File("D:\\Software\\apache-tomcat-7.0.29\\webapps\\Hello\\temp"));
// Create a new file upload handler
ServletFileUpload upload = new ServletFileUpload(factory);
// maximum file size to be uploaded.
upload.setSizeMax(maxFileSize);
try {
// Parse the request to get file items.
List fileItems = upload.parseRequest(request);
// Process the uploaded file items
Iterator i = fileItems.iterator();
out.println("<html>");
out.println("<head>");
out.println("<title>Servlet upload</title>");
out.println("</head>");
out.println("<body>");
while (i.hasNext()) {
FileItem fi = (FileItem) i.next();
if (!fi.isFormField()) {
// Get the uploaded file parameters
String fieldName = fi.getFieldName();
String fileName = fi.getName();
String contentType = fi.getContentType();
boolean isInMemory = fi.isInMemory();
long sizeInBytes = fi.getSize();
// Write the file
if (fileName.lastIndexOf("\\") >= 0) {
file = new File(filePath + fileName.substring(fileName.lastIndexOf("\\")));
} else {
file = new File(filePath + fileName.substring(fileName.lastIndexOf("\\") + 1));
}
fi.write(file);
out.println("Uploaded Filename: " + fileName + "<br>");
}
}
} catch (Exception ex) {
out.println("Your file size should be less than 10 or equal to 10kb" + ex);
}
try {
/* TODO output your page here. You may use following sample code. */
out.println("<h1>"+gi+"</h1>");
try {
Class.forName("com.mysql.jdbc.Driver");
Connection conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/webSiteTest", "root", "root");
PreparedStatement stat = conn.prepareStatement("insert into abc(name) values (?)");
stat.setString(1, gi);
int aa = stat.executeUpdate();
JOptionPane.showMessageDialog(null, "Database Connected Successfully.");
} catch (SQLException ex) {
JOptionPane.showMessageDialog(null, "Query Error!");
} catch (ClassNotFoundException ee) {
JOptionPane.showMessageDialog(null, "Database not Found!");
}
out.println("</body>");
out.println("</html>");
} finally {
out.close();
}
}
@Override
public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, java.io.IOException {
processRequest(request, response);
}
@Override
public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, java.io.IOException {
//throw new ServletException("GET method used with " + getClass().getName() + ": POST method required.");
processRequest(request, response);
}
}
我怎样才能做到这一点。